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1、分类号S714.5学校代码10129UDC631.4学号2009204032兴安落叶松林生态系统碳积累特征的研究StudyonEcologicalsystemcarbonaccumulationcharacteristicsofthelarixGmeliniForest申请人:秀英学科门类:农学学科专业:土壤学研究方向:森林土壤指导教师:魏江生教授论文提交日期:二〇一二年五月摘要本文以兴安落叶松林生态系统为研究对象,对其进行生物量,凋落物量、土壤碳贮量、土壤呼吸、根系生长及分解等测定分析,得出兴安落叶松林生态系统碳输
2、入量及碳输出量,评价其碳平衡。主要得到的结论如下:21兴安落叶松林生态系统总碳贮量为287.48t/hm,土壤层碳贮量为最大222242.17t/hm,草本层碳贮量为最小0.68t/hm,乔木层碳贮量为25.26t/hm,灌22木层碳贮量为12.43t/hm,凋落物层碳贮量为6.94t/hm,其大小顺序为土壤层>乔木层>灌木层>凋落物层>草本层。222兴安落叶松林总碳输入量为8.81t/hm,凋落物碳输入量为5.60t/hm,根系2生长碳输入量为3.21t/hm,凋落物碳输入量要大于根系碳输入量。3兴安落叶松林土壤呼
3、吸在生长季内成单峰曲线,峰值出现在温度相对较高的2植物开始生长的7月份,6月份最低,土壤呼吸年碳排放量为2.56t/hm。五个不同处理(凋落物去除、凋落物加倍、挖壕法去除地下细根、挖壕法去除地下细根去除凋落物、对照)对土壤呼吸都有一定的影响。挖壕法去除地下细根影响最显著,除了凋落物加倍会增加土壤呼吸速率外其它处理土壤呼吸速率都有所减小。4兴安落叶松林生态系统碳输入和碳输出的差值为6.25,为正数,因此兴安落叶松林生态系统显现出碳汇功能。关键词:兴安落叶松;碳贮量;凋落物;土壤呼吸;碳平衡StudyonEcologic
4、alsystemcarbonaccumulationcharacteristicsofthelarixGmeliniForestAbstractThispaperischaracterizedwiththeLarixgmeliniiecologicalsystemastheresearchobject,Thebiomass,littercontent,soilmoisture,soilcarbonbreathing,rootgrowthanddecompositionanalysisdetermination,obt
5、ainthatthelarixGmeliniforestecologicalsysteminputofthecarbonandcarbonoutput,andevaluateitscarbonbalance.TheMainconclusionsareasfollows:21TheLarixgmeliniitotalcarbonstoragefor287.48t/hm,thelayerofsoilcarbon2storageforthemaximum242.17t/hm,herbaceouslayerofcarbons
6、toragefor22minimum0.68t/hm,treelayerofcarbonstoragefor25.26t/hm,shrublayerof22carbonstoragefor12.43t/hm,litterlayerofcarbonstoragefor6.94t/hm.Thesizeoftheorderofthesoillayer(84.24%)>treelayer(8.79%)>shrublayer(4.32%)>litterlayer(2.41%)>herblayer(0.24%).22TheLar
7、ixgmeliniicarboninputcapacityof8.81t/hm,littercarboninputamount2greaterthanrootcarboninputquantity,biomassofforestlitteris5.60t/hm,root2growthrateis3.21t/hm.3TheLarixgmeliniisoilrespirationduringthegrowthseasonintoasinglepeakcurve,peakoccursatrelativelyhightemp
8、eraturetheplantsbegantogrowinJuly,thelowestinJune.Fivedifferentprocessing(litterremoval,removalofdoubletrenchdiggingundergroundroot,trenchingmethodforremovalofundergroundroo